diff --git a/poetry.lock b/poetry.lock
index 037870aaea..34051cc0c2 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -190,6 +190,17 @@ optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 version = "2.8"
 
+[[package]]
+category = "dev"
+description = "Read metadata from Python packages"
+name = "importlib-metadata"
+optional = false
+python-versions = ">=2.7,!=3.0,!=3.1,!=3.2,!=3.3"
+version = "0.17"
+
+[package.dependencies]
+zipp = ">=0.5"
+
 [[package]]
 category = "dev"
 description = "A Python utility / library to sort Python imports."
@@ -215,6 +226,18 @@ optional = false
 python-versions = ">=3.4"
 version = "6.0.0"
 
+[[package]]
+category = "dev"
+description = "Core utilities for Python packages"
+name = "packaging"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "19.0"
+
+[package.dependencies]
+pyparsing = ">=2.0.2"
+six = "*"
+
 [[package]]
 category = "dev"
 description = "pdb++, a drop-in replacement for pdb"
@@ -234,7 +257,10 @@ description = "plugin and hook calling mechanisms for python"
 name = "pluggy"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "0.11.0"
+version = "0.12.0"
+
+[package.dependencies]
+importlib-metadata = ">=0.12"
 
 [[package]]
 category = "dev"
@@ -268,6 +294,14 @@ optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 version = "2.4.1"
 
+[[package]]
+category = "dev"
+description = "Python parsing module"
+name = "pyparsing"
+optional = false
+python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
+version = "2.4.0"
+
 [[package]]
 category = "dev"
 description = "A library for building flexible command line interfaces"
@@ -282,15 +316,16 @@ description = "pytest: simple powerful testing with Python"
 name = "pytest"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "4.5.0"
+version = "4.6.1"
 
 [package.dependencies]
 atomicwrites = ">=1.0"
 attrs = ">=17.4.0"
 colorama = "*"
-pluggy = ">=0.9,<0.10 || >0.10,<1.0"
+importlib-metadata = ">=0.12"
+packaging = "*"
+pluggy = ">=0.12,<1.0"
 py = ">=1.5.0"
-setuptools = "*"
 six = ">=1.10.0"
 wcwidth = "*"
 
@@ -422,8 +457,16 @@ optional = false
 python-versions = "*"
 version = "0.3"
 
+[[package]]
+category = "dev"
+description = "Backport of pathlib-compatible object wrapper for zip files"
+name = "zipp"
+optional = false
+python-versions = ">=2.7"
+version = "0.5.1"
+
 [metadata]
-content-hash = "e53b5b3b314d3e1775816c8195b6be8093ad2bbac426debe39d39da3f7e9308a"
+content-hash = "78802284424e500df41795cdbe427ec83d88a0205af2ec8f8a157f1c26951bb9"
 python-versions = "^3.7"
 
 [metadata.hashes]
@@ -447,17 +490,20 @@ h11 = ["acca6a44cb52a32ab442b1779adf0875c443c689e9e028f8d831a3769f9c5208", "f2b1
 httptools = ["e00cbd7ba01ff748e494248183abc6e153f49181169d8a3d41bb49132ca01dfc"]
 hupper = ["cb33b8f1de73a3566f4bd7decc620d0c6de7d7da9cdf176b6ad310fe037d6106", "fe8febd68cec7fbed174fcbb0b42c427f96c8a7471c1cd4999fc698dd8dc6c34"]
 idna = ["c357b3f628cf53ae2c4c05627ecc484553142ca23264e593d327bcde5e9c3407", "ea8b7f6188e6fa117537c3df7da9fc686d485087abf6ac197f9c46432f7e4a3c"]
+importlib-metadata = ["a9f185022cfa69e9ca5f7eabfd5a58b689894cb78a11e3c8c89398a8ccbb8e7f", "df1403cd3aebeb2b1dcd3515ca062eecb5bd3ea7611f18cba81130c68707e879"]
 isort = ["c40744b6bc5162bbb39c1257fe298b7a393861d50978b565f3ccd9cb9de0182a", "f57abacd059dc3bd666258d1efb0377510a89777fda3e3274e3c01f7c03ae22d"]
 mccabe = ["ab8a6258860da4b6677da4bd2fe5dc2c659cff31b3ee4f7f5d64e79735b80d42", "dd8d182285a0fe56bace7f45b5e7d1a6ebcbf524e8f3bd87eb0f125271b8831f"]
 more-itertools = ["0125e8f60e9e031347105eb1682cef932f5e97d7b9a1a28d9bf00c22a5daef40", "590044e3942351a1bdb1de960b739ff4ce277960f2425ad4509446dbace8d9d1"]
+packaging = ["0c98a5d0be38ed775798ece1b9727178c4469d9c3b4ada66e8e6b7849f8732af", "9e1cbf8c12b1f1ce0bb5344b8d7ecf66a6f8a6e91bcb0c84593ed6d3ab5c4ab3"]
 pdbpp = ["ee7eab02ecf32d92bd66b45eedb9bda152fa13f7be0dceb7050413a52cbbc4dd"]
-pluggy = ["25a1bc1d148c9a640211872b4ff859878d422bccb59c9965e04eed468a0aa180", "964cedd2b27c492fbf0b7f58b3284a09cf7f99b0f715941fb24a439b3af1bd1a"]
+pluggy = ["0825a152ac059776623854c1543d65a4ad408eb3d33ee114dff91e57ec6ae6fc", "b9817417e95936bf75d85d3f8767f7df6cdde751fc40aed3bb3074cbcb77757c"]
 py = ["bf92637198836372b520efcba9e020c330123be8ce527e535d185ed4b6f45694", "e76826342cefe3c3d5f7e8ee4316b80d1dd8a300781612ddbc765c17ba25a6c6"]
 pycodestyle = ["95a2219d12372f05704562a14ec30bc76b05a5b297b21a5dfe3f6fac3491ae56", "e40a936c9a450ad81df37f549d676d127b1b66000a6c500caa2b085bc0ca976c"]
 pyflakes = ["5e8c00e30c464c99e0b501dc160b13a14af7f27d4dffb529c556e30a159e231d", "f277f9ca3e55de669fba45b7393a1449009cff5a37d1af10ebb76c52765269cd"]
 pygments = ["36586500a94cd97f8c2c19d251cdb78868d1a822e0e491bfc1d811766aedb772", "b437bc0d04dc36f1f5b3592985b3e0a3d0af46b7c39199231706d19a4ee63344"]
+pyparsing = ["1873c03321fc118f4e9746baf201ff990ceb915f433f23b395f5580d1840cb2a", "9b6323ef4ab914af344ba97510e966d64ba91055d6b9afa6b30799340e89cc03"]
 pyrepl = ["3bcbbf1e47d2b80819b805aceea16dc90832ba4800035d595fa3c4bf48fcd4d7"]
-pytest = ["1a8aa4fa958f8f451ac5441f3ac130d9fc86ea38780dd2715e6d5c5882700b24", "b8bf138592384bd4e87338cb0f256bf5f615398a649d4bd83915f0e4047a5ca6"]
+pytest = ["8304c2f6466cf48f24631263d60320a1996668acfd659d8fa5e5e8f28129e1cd", "b68d84c7c01073ddf2a918a7504ab73849d52483d9f1f15f3875487011d09f71"]
 pytest-asyncio = ["9fac5100fd716cbecf6ef89233e8590a4ad61d729d1732e0a96b84182df1daaf", "d734718e25cfc32d2bf78d346e99d33724deeba774cc4afdf491530c6184b63b"]
 pytest-emoji = ["6e34ed21970fa4b80a56ad11417456bd873eb066c02315fe9df0fafe6d4d4436", "e1bd4790d87649c2d09c272c88bdfc4d37c1cc7c7a46583087d7c510944571e8"]
 requests = ["502a824f31acdacb3a35b6690b5fbf0bc41d63a24a45c4004352b0242707598e", "7bf2a778576d825600030a110f3c0e3e8edc51dfaafe1c146e39a2027784957b"]
@@ -471,3 +517,4 @@ uvloop = ["198fe0c196056930ec6c4a0a878e531a66d15467ca7c74a875aa90271f0c6e3f", "1
 wcwidth = ["3df37372226d6e63e1b1e1eda15c594bca98a22d33a23832a90998faa96bc65e", "f4ebe71925af7b40a864553f761ed559b43544f8f71746c2d756c7fe788ade7c"]
 websockets = ["04b42a1b57096ffa5627d6a78ea1ff7fad3bc2c0331ffc17bc32a4024da7fea0", "08e3c3e0535befa4f0c4443824496c03ecc25062debbcf895874f8a0b4c97c9f", "10d89d4326045bf5e15e83e9867c85d686b612822e4d8f149cf4840aab5f46e0", "232fac8a1978fc1dead4b1c2fa27c7756750fb393eb4ac52f6bc87ba7242b2fa", "4bf4c8097440eff22bc78ec76fe2a865a6e658b6977a504679aaf08f02c121da", "51642ea3a00772d1e48fb0c492f0d3ae3b6474f34d20eca005a83f8c9c06c561", "55d86102282a636e195dad68aaaf85b81d0bef449d7e2ef2ff79ac450bb25d53", "564d2675682bd497b59907d2205031acbf7d3fadf8c763b689b9ede20300b215", "5d13bf5197a92149dc0badcc2b699267ff65a867029f465accfca8abab95f412", "5eda665f6789edb9b57b57a159b9c55482cbe5b046d7db458948370554b16439", "5edb2524d4032be4564c65dc4f9d01e79fe8fad5f966e5b552f4e5164fef0885", "79691794288bc51e2a3b8de2bc0272ca8355d0b8503077ea57c0716e840ebaef", "7fcc8681e9981b9b511cdee7c580d5b005f3bb86b65bde2188e04a29f1d63317", "8e447e05ec88b1b408a4c9cde85aa6f4b04f06aa874b9f0b8e8319faf51b1fee", "90ea6b3e7787620bb295a4ae050d2811c807d65b1486749414f78cfd6fb61489", "9e13239952694b8b831088431d15f771beace10edfcf9ef230cefea14f18508f", "d40f081187f7b54d7a99d8a5c782eaa4edc335a057aa54c85059272ed826dc09", "e1df1a58ed2468c7b7ce9a2f9752a32ad08eac2bcd56318625c3647c2cd2da6f", "e98d0cec437097f09c7834a11c69d79fe6241729b23f656cfc227e93294fc242", "f8d59627702d2ff27cb495ca1abdea8bd8d581de425c56e93bff6517134e0a9b", "fc30cdf2e949a2225b012a7911d1d031df3d23e99b7eda7dfc982dc4a860dae9"]
 wmctrl = ["d806f65ac1554366b6e31d29d7be2e8893996c0acbb2824bbf2b1f49cf628a13"]
+zipp = ["8c1019c6aad13642199fbe458275ad6a84907634cc9f0989877ccc4a2840139d", "ca943a7e809cc12257001ccfb99e3563da9af99d52f261725e96dfe0f9275bc3"]
diff --git a/pyproject.toml b/pyproject.toml
index 6d029367cc..213aa1f982 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -27,7 +27,7 @@ pygments = "^2.3"
 uvicorn = "^0.4.6"
 
 [tool.poetry.dev-dependencies]
-pytest = "^4.5"
+pytest = "^4.6"
 pdbpp = "^0.10.0"
 bpython = "^0.18"
 pytest-emoji = "^0.2.0"